Help understanding structure behaviior in esp now example

[J-M-L]

@rick3939

• How does the String member get packed into the structure if it is dynamically allocated and expandable? I expanded it with the loop that added a character with every iteration. It works on the sender and can be printed to serial. I can fill it with hundreds of chars and still get 56 bytes from sizeof(myData).

what gets packed in the struct is the pointer to the dynamic area (on the heap) where the text is kept. Your structure is therefore not flat anymore.

When you send the structure, you just send the pointer address and not the content, and obviously the receiver can't do anything with that pointer.